Charter School Achievement: What We Know [pdf] Several recent reports have raised questions about the performance of public charter schools. To answer these questions, and provide a full and fair picture of how charter schools are actually doing, the National Alliance for Public Charter Schools commissioned an extensive review of the available research on charter school achievement. The third edition of this report, issued in October 2006, summarizes and evaluates 58 comparative analyses of charter school and traditional public school performance, including a study-by-study look at central findings and methodological strengths and weaknesses.